100分相送----救救我啊！！！jsp问题

我的jsp文件老是报错，不知为何？
我用的是myeclipse 创建一个tomcat工程（MyTomcat），再在工程中添加一个index.jsp和一个welcom.html（用myeclipse生成的，自己甚至没加任何代码）
我在浏览器中输入http://localhost:8080/,显示tomcat页面
输入http://localhost:8080/MyTomcat/welcom.html/ 正常。
输入http://localhost:8080/MyTomcat/index.jsp/ ,浏览器老是报错啊！妈的，不知怎么回事！！救救我啊！！！

HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to load class for JSP
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:584)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:177)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:296)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)


root cause

java.lang.ClassNotFoundException: org.apache.jsp.index_jsp
java.net.URLClassLoader$1.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(Unknown Source)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:192)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:110)
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:582)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:177)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:296)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)


note The full stack trace of the root cause is available in the Tomcat logs.